This was a Phase IV, open-label, non-randomized, multi-center study conducted in community based practices, physicians networks, or academic institutions in the US. This study included anemic (Hb < 12 g/dL) HIV-infected subjects and HIV/hepatitis C (HCV) co-infected subjects not receiving HCV treatment on a stable anti-retroviral therapy (ART) regimen for at least 4 weeks prior to enrollment.